Add linting

Author: Codex-

.eslintrc.json

@@ -0,0 +1,33 @@
+{
+  "plugins": ["import", "prettier"],
+  "extends": ["airbnb-typescript/base", "prettier"],
+  "parserOptions": {
+    "project": "./tsconfig.test.json"
+  },
+  "ignorePatterns": ["lib/__fixtures__/**/*.ts", "jest.config.ts", "dist"],
+  "rules": {
+    "@typescript-eslint/await-thenable": "warn",
+    "@typescript-eslint/no-floating-promises": [
+      "warn",
+      { "ignoreIIFE": true, "ignoreVoid": false }
+    ],
+    "@typescript-eslint/no-unused-vars": [
+      "warn",
+      { "argsIgnorePattern": "^_" }
+    ],
+    "import/order": "warn",
+    "import/no-extraneous-dependencies": [
+      "error",
+      {
+        "devDependencies": true,
+        "optionalDependencies": true,
+        "peerDependencies": true
+      }
+    ],
+    "import/prefer-default-export": "off",
+    "no-console": ["warn"],
+    "no-plusplus": "off",
+    "prettier/prettier": "warn",
+    "radix": ["error", "as-needed"]
+  }
+}

.github/workflows/build.yml

@@ -26,6 +26,9 @@ jobs:
       - name: test
         if: ${{ always() }}
         run: npm run test
+      - name: lint
+        if: ${{ always() }}
+        run: npm run lint
       - name: style
         if: ${{ always() }}
         run: npm run format:check

.prettierignore

@@ -1 +1,2 @@
 dist
+lib/__fixtures__

lib/index.spec.ts

@@ -1,6 +1,6 @@
-import TypeScriptLoader from ".";
-import { cosmiconfig, cosmiconfigSync } from "cosmiconfig";
 import path from "path";
+import { cosmiconfig, cosmiconfigSync } from "cosmiconfig";
+import TypeScriptLoader from ".";
 
 describe("TypeScriptLoader", () => {
   const fixturesPath = path.resolve(__dirname, "__fixtures__");

lib/loader.spec.ts

@@ -1,7 +1,6 @@
 import fs from "fs";
 import path from "path";
 import { Loader } from "cosmiconfig";
-
 import { TypeScriptLoader } from "./loader";
 import { TypeScriptCompileError } from "./typescript-compile-error";
 

lib/typescript-compile-error.spec.ts

@@ -20,16 +20,16 @@ describe("TypeScriptCompileError", () => {
     it("should replace the legacy tsc error string", () => {
       const testMsg =
         "TypeScript compiler encountered syntax errors while transpiling. Errors: ";
-      const testError = new Error(testMsg);
-      const tscError = TypeScriptCompileError.fromError(testError);
+      const legacyError = new Error(testMsg);
+      const tscError = TypeScriptCompileError.fromError(legacyError);
 
       expect(tscError).not.toContainEqual(testMsg);
     });
 
     it("should replace the tsc error string", () => {
       const testMsg = "⨯ Unable to compile TypeScript:";
-      const testError = new Error(testMsg);
-      const tscError = TypeScriptCompileError.fromError(testError);
+      const newError = new Error(testMsg);
+      const tscError = TypeScriptCompileError.fromError(newError);
 
       expect(tscError).not.toContainEqual(testMsg);
     });

lib/typescript-compile-error.ts

@@ -1,7 +1,7 @@
 export class TypeScriptCompileError extends Error {
   constructor(message: string) {
     super(message);
-    this.name = this.constructor.name
+    this.name = this.constructor.name;
   }
 
   public static fromError(error: Error): TypeScriptCompileError {